CN113250785A

CN113250785A - Rotary filter

Info

Publication number: CN113250785A
Application number: CN202110766527.5A
Authority: CN
Inventors: 陈永峤; 韩旭
Original assignee: Shanghai Fleetguard Filter Co ltd
Current assignee: Shanghai Fleetguard Filter Co ltd
Priority date: 2021-07-07
Filing date: 2021-07-07
Publication date: 2021-08-13

Abstract

The invention relates to the field of filters, and discloses a rotary filter which comprises a shell, a sealing ring seat and a filter element assembly arranged in the shell, wherein the outer side wall of one end of the shell is provided with a threaded part which is configured to fix the filter; the filter element assembly comprises a filter element upper end cover, a filter element connected with the filter element upper end cover and a filter element lower end cover, and the filter element upper end cover is fixedly connected with the seal ring seat. The rotary filter is connected with the mounting base through the threads arranged on the shell, a threaded cover plate is not needed, a spring and a mounting structure which are arranged between the shell and the lower end cover of the filter element are omitted, and the distance between the shell and the lower end cover of the filter element can be reduced.

Description

Rotary filter

Technical Field

The invention relates to the field of filters, in particular to a rotary filter.

Background

A filter refers to a device or assembly that passes a fluid through a porous material to separate impurities therefrom, typically used in the automotive field, and is an engine component. Fuel or oil needs to pass through a filtration system, the main component of which is a filter, to remove contaminants from the fuel or oil before it enters the engine. The most typical and most widely used of these is the spin-on filter.

However, the traditional spin-on fuel filter has the disadvantages of more parts, large volume and the like. Typically, such arrangements as springs between the housing and the lower end cap of the filter cartridge and separate threaded cover plates for mounting the filter to the base result in higher design and manufacturing costs, and do not meet the requirements of compact, low cost, light weight and environmental friendliness of modern product designs.

Disclosure of Invention

The invention aims to provide a rotary filter to solve the problems of multiple filter parts and large volume in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

a rotary filter comprises a shell, a sealing ring seat buckled on the shell and a filter element assembly arranged between the buckled shell and the sealing ring seat; the shell is in a cylindrical shape with an opening at one end, a thread wall is arranged on the side wall close to the opening, and the thread wall is configured to fix the filter; the filter element assembly comprises a filter element upper end cover and a filter element connected with the filter element upper end cover, and the filter element upper end cover is welded with the seal ring seat; the seal ring seat is provided with an inlet and an outlet, and fluid can enter the outer side of the filter element from the inlet and flow through the inner side of the filter element and flow out through the outlet.

Preferably, the sealing ring further comprises an outer sealing ring, the sealing ring seat is provided with a transverse wall and a vertical wall, the inner side of the side wall, the transverse wall and the vertical wall jointly form a sealing groove, and the outer sealing ring is embedded in the sealing groove.

Preferably, the seal ring seat is further provided with an inclined wall, the side wall further comprises a guide wall, and the inclined wall and the guide wall are matched for guiding so as to facilitate installation of the seal ring seat.

Preferably, the outer sealing ring is a circular rubber ring, the outer wall of the outer sealing ring is provided with a sealing bulge, and the sealing bulge is abutted to the guide wall and used for blocking the communication between the inside and the outside of the filter.

Preferably, the side wall is provided with a rib protruding inwards, and the bottom surface of the seal ring seat is abutted to the rib.

Preferably, the seal ring seat further comprises a pit, and the bottom of the pit is welded with the filter element upper end cover.

Preferably, the filter element further comprises an inner sealing ring, wherein the inner sealing ring abuts between the sealing ring seat and the filter element upper end cover and is used for blocking the communication between the inlet and the outlet.

Preferably, the seal ring seat further comprises a seal flange, the inner seal ring is provided with an upper seal surface, and an inner ring of the upper seal surface abuts against an outer ring of the seal flange.

Preferably, the inner sealing ring further comprises a check valve, the check valve is arranged between the inlet and the outside of the filter element, so that fluid flows from the inlet to the outside of the filter element in a one-way mode, and the check valve and the inner sealing ring are of an integrated structure.

Preferably, the filter element assembly further comprises a filter element lower end cover connected to the bottom of the filter element.

The invention has the beneficial effects that:

according to the rotary filter provided by the invention, the sealing ring seat is welded with the upper end cover of the filter element in order to support the filter element assembly, so that a spring arranged between the shell and the lower end cover of the filter element in the prior art is omitted, the number of parts is reduced, and meanwhile, the distance between the shell and the lower end cover of the filter element can be shortened. In addition, the filter shell is provided with the external thread to form the thread wall, and the filter is installed in an automobile engine compartment or on an installation base of an automobile chassis through the thread wall on the shell, so that a thread flange of a thread cover plate in the prior art is omitted, and the reliability of the filter is improved.

Drawings

FIG. 1 is a schematic sectional view of the assembly of a spin-on filter and a base according to the present invention;

FIG. 2 is a schematic cross-sectional view of a spin-on filter according to the present invention;

FIG. 3 is a schematic cross-sectional view of a housing of a spin-on filter provided in the present invention;

FIG. 4 is a schematic cross-sectional view of a seal ring seat of a spin-on filter according to the present invention;

FIG. 5 is a schematic cross-sectional view of an outer sealing ring of a spin-on filter according to the present invention;

FIG. 6 is a schematic cross-sectional view of an upper end cap of a filter element of a spin-on filter according to the present invention;

FIG. 7 is a schematic view of a filter element structure of a spin-on filter provided by the present invention;

FIG. 8 is a schematic cross-sectional view of a lower end cap of a filter element of a spin-on filter according to the present invention;

FIG. 9 is a schematic cross-sectional view of an inner seal ring of a spin-on filter according to the present invention;

FIG. 10 is a schematic structural view of a center tube of a spin-on filter provided by the present invention;

FIG. 11 is a cross-sectional flow schematic of fluid within a spin-on filter provided by the present invention.

In the figure:

1-a housing; 11-a side wall; 111-a threaded wall; 112-a guide wall; 113-a rib; 114-a snap wall;

2-sealing ring seat; 201-inlet; 202-an outlet; 21-an inclined wall; 22-transverse wall; 23-a vertical wall; 24-pits; 25-sealing flange;

3, an upper end cover of the filter element;

4-a filter element;

5-outer sealing ring; 51-sealing projection;

6-inner sealing ring; 61-upper sealing surface; 62-check flap; 63-a first sealing ring; 64-a second seal ring;

7-filter element lower end cover; 71-a bypass valve;

8-a central tube;

9-mounting a base; 91-an oil inlet; 92-an oil outlet; 93-oil outlet pipeline.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

A filter refers to a device or assembly that passes a fluid through a porous material to separate impurities from the fluid. Generally referred to as an automotive filter, is an accessory part of an engine, and is usually mounted in an engine compartment or on a mounting base of a vehicle chassis. The filter described in this embodiment is configured to filter a fluid such as oil or fuel. However, it is contemplated that the concepts described herein may be applied to filters that filter other types of fluids, including conventional liquids such as water and air. In addition, the filters described herein are configured to flow through the filter element from the outside to the inside along the radial surface during filtration.

The filter is used in conjunction with the vehicle mounting base and filters engine oil as an example, but the filter may be used in other applications requiring filtering. Fig. 1 is a schematic sectional view showing an assembly of a spin-on filter and a mount, in which a mount base 9 is fixedly attached to an engine room of an automobile, and the mount base 9 includes an oil inlet 91 for oil to be filtered by the filter, an oil outlet 92 for oil filtered by the filter, and an oil outlet pipe 93 connected to the oil outlet 92. When the rotary filter is installed in the installation base 9, an annular space is formed between the rotary filter and the installation base 9. One end of the oil inlet 91 is communicated with the annular space at the top of the filter, and the other end of the oil inlet 91 is connected with the oil pump. One end of the oil outlet 92 is communicated with an outlet of the filter, the other end of the oil outlet 92 is connected with the engine, the engine oil filtered by the filter is purer, the impurities are less, the influence of the impurities on the engine is reduced, and the service life of the engine is ensured. As shown in fig. 1, the mounting base 9 further includes an internal thread formed inside the connecting wall thereof, and the filter is screwed to the internal thread on the mounting base 9 and seals the joint by a sealing member, so that the oil inlet 91 and the oil outlet 92 on the mounting base 9 are communicated with each other through the screw-on filter. The spin-on filter is configured to be removably attached to a mounting base of a vehicle, and the term "spin-on" as used herein refers to the use of rotation to effect attachment or detachment of the filter to the mounting base 9.

In the prior art, the rotary filter has the defects of more parts, large volume and the like. Typically, a spring is provided, for example, between the housing 1 and the cartridge bottom end cap, to support the connection of the cartridge assembly to the top threaded cover plate, thereby increasing the length of the filter. And when the spring loses efficacy or the position deviates, the filter element assembly can be separated from the threaded cover plate at the top, the oil way sealing fails, and finally the oil leakage failure of the filter is caused.

In addition, the filter is usually provided with an upwardly bent flange on the inner edge of the threaded cover plate, and the flange is provided with an internal thread, whereby the filter is mounted on a mounting base 9 in the engine compartment. These structures result in high design and manufacturing costs, and do not meet the requirements of compact structure, low cost, light weight and environmental protection in modern product design.

As shown in fig. 2, the spin-on filter in the present embodiment generally includes a housing 1, a seal ring seat 2 fastened to the housing 1, and a filter element assembly and a sealing element disposed between the housing 1 and the seal ring seat 2. The seal ring seat 2 is provided with an inlet 201 and an outlet 202. The filter element assembly comprises a filter element 4 arranged in a hollow area formed by the shell 1 and the seal ring seat 2, a filter element upper end cover 3 connected with one end of the filter element 4, and a filter element lower end cover 7 connected with the other end of the filter element 4. The filter element assembly further comprises a central tube 8, the central tube 8 is positioned on the coaxial inner side of the filter element 4 and vertically extends to the filter element upper end cover 3 from the filter element lower end cover 7 to support the filter element 4 in the vertical direction, and engine oil filtered by the filter element 4 can flow to the outlet 202 through the central tube 8. In order to support the filter element assembly, the filter element upper end cover 3 is fixedly connected with the seal ring seat 2 in a welding manner, the seal ring seat 2 is welded with the filter element upper end cover 3, a supporting spring arranged between the shell 1 and the filter element lower end cover 7 in the prior art is omitted, the number of parts is reduced, and meanwhile, the distance between the shell 1 and the filter element lower end cover 7 can be shortened. An inner sealing ring 6 is arranged at the gap of the upper end cover 3 of the filter element and the inner periphery of the sealing ring seat 2, and completely isolates an inlet 201 and an outlet 202 in the filter. When the filter is mounted on the mounting base 9, the inner seal 6 also completely isolates the oil inlet 91 from the oil outlet 92. The outer sealing ring 5 is arranged between the inner periphery of the shell 1 and the outer periphery of the sealing ring seat 2, so that the engine oil to be filtered can not flow out of the filter from the joint of the shell 1 and the sealing ring seat 2.

Specifically, as shown in fig. 3, the housing 1 has a cylindrical shape with an opening provided at one end. Optionally, the housing 1 comprises a bottom end wall and a side wall 11 extending from the bottom end wall to one side. In one embodiment, the bottom end wall and the side wall 11 may be integrally stamped; in other embodiments, the bottom end wall and the side wall 11 may be made by welding two separate pieces. The side wall 11 and the bottom end wall together enclose a space in which the filter insert 4 is accommodated. Alternatively, this receiving space is formed as a cylindrical space coaxial with the filter element 4. When the filter is used for an engine to filter engine oil, the engine oil flows through the space, and the filter element 4 filters the flowing engine oil to remove impurities therein. Optionally, the outer circumference of the side wall 11 is also uniformly arranged with an anti-slip structure, which facilitates installation of the filter. In the present embodiment, the anti-slip structure is formed by partially recessing the sidewalls 11, and forming anti-slip ribs between the recessing sidewalls. In one embodiment, the housing 1 is made of steel. In other embodiments, if the housing 1 is capable of withstanding the operating environment, including the load and pressure of the filter, the housing 1 may be formed from other materials, including plastics.

A screw wall 111 is provided near the side wall 11 of the opening of the housing 1, and the screw wall 111 is configured to fix the filter. The invention arranges the thread wall 111 on the side wall 11 to mount the filter on the mounting base 9 in the engine compartment of the automobile, and omits the thread flange on the thread cover plate in the prior art. Meanwhile, the threads on the side wall 11 are larger than those on the threaded cover plate in the prior art, so that the connection strength of the filter and the position to be installed can be increased. The technical improvement optimizes the product structure, reduces the number of parts, reduces the product volume, reduces the design cost and the manufacturing cost, and enhances the product reliability and the environmental protection.

The side wall 11 further includes a guide wall 112 disposed at the opening, and a snap-fit wall 114 and an inwardly protruding rib 113 disposed in sequence near the guide wall 112, wherein the guide wall 112 is used for guiding the connection when the seal ring seat 2 is connected to the housing 1, and the guide wall 112 is disposed obliquely toward the outer side of the side wall 11 or disposed in an arc shape. In this embodiment, the sealing ring seat 2 and the clamping wall 114 are in interference fit, and compared with other fitting methods, the scheme does not need other parts, reduces the product volume, reduces the product weight, and reduces the design cost and the manufacturing cost. When the seal ring seat 2 is attached, the bottom surface of the seal ring seat 2 abuts against the rib 113, thereby ensuring positioning. In this embodiment, the cross-section of the rib 113 is triangular.

Further, as shown in fig. 4, in the present embodiment, the seal ring seat 2 is a circular stamping part, and all the structures thereon are integrally formed by stamping. For ease of manufacture, the gasket seat 2 and the housing 1 are preferably made of the same material. However, as described below, the seal ring seat 2 and the housing 1 may be formed of different materials if necessary or deemed advantageous to perform the intended sealing function of the seal ring seat 2. The material used to form the gasket seat 2 may be any material suitable for performing the intended function of the gasket seat 2 and the housing 1. Meanwhile, manufacturing processes such as melt injection molding or 3D printing can be used in conformity with the material. For example, the seal ring seat 2 may be formed of a photosensitive resin, an alloy, a reinforced plastic, or other material.

The seal ring seat 2 is provided with an inlet 201 and an outlet 202, and the engine oil to be filtered can enter the filter from the inlet 201, flow from the outer side of the filter element 4 to the inner side of the filter element 4, and then flow out through the central tube 8 via the outlet 202. When the filter is mounted on the mounting base 9, the only path for fluid to enter the filter during intended use of the filter is through the inlet 201 and the path for fluid to exit the filter is through the outlet 202. The inner ring of the sealing ring seat 2 is the outlet 202; be provided with a plurality of imports 201 on the seal ring seat 2, import 201 is evenly arranged along the torus of seal ring seat 2, guarantees treating smooth and easy, the even inflow of filter oil. The diameter of the outer edge of the ring of the sealing ring seat 2 is slightly larger than the diameter of the opening of the casing 1, the sealing ring seat 2 is in interference fit with the casing 1, and the inner space of the filter is partitioned, and the matching is specifically explained below.

In this embodiment, the seal ring seat 2 is further provided with an inclined wall 21, a horizontal wall 22 and a vertical wall 23, and the inclined wall 21, the horizontal wall 22 and the vertical wall 23 are all integrally formed by punching. Alternatively, the inclined wall 21, the transverse wall 22 and the vertical wall 23 may be connected to the seal ring seat 2 by welding. The inner side of the side wall 11, the inclined wall 21, the transverse wall 22 and the vertical wall 23 together form a sealing groove. The sealing groove can be constructed under the condition that no additional part is added, so that the outer sealing ring 5 is embedded in the sealing groove, and the tightness of the filter is guaranteed. Two other advantageous effects of the inclined wall 21 will be described in detail below, first, the inclined wall 21 abuts against the rib 113 on the side wall 11, and the inclined wall 21 can be more adapted to the shape of the rib 113, so that the abutment is more reliable. Secondly, the inclined wall 21 also serves as a guide for cooperating with the guide wall 112 during assembly, facilitating the installation of the seal ring holder 2. In this embodiment, the fitting manner of the inclined wall 21 and the clamping wall 114 is interference fit, and compared with other fitting manners, the scheme does not need other parts, reduces the product volume, reduces the product weight, and reduces the design cost and the manufacturing cost.

As shown in fig. 5, the outer seal ring 5 is located in the seal groove formed by the housing 1 and the seal ring seat 2, and continuously surrounds the seal ring seat 2. The outer sealing ring 5 is used for static sealing, so the circular rubber ring adopted in the embodiment has the characteristics of low cost, good corrosion resistance, easy replacement and the like. And when the filter is installed on the installation base 9, the top end of the outer sealing ring 5 is abutted against the inner wall of the installation base 9, so that the engine oil to be filtered is prevented from flowing into the threaded connection part of the filter and the installation base 9 from the oil inlet 91, and the engine oil to be filtered is also prevented from flowing into the filter from the connection part of the sealing ring seat 2 and the shell 1. Optionally, the material of the outer sealing ring 5 may also be a thermoplastic elastomer, depending on the differences in the bodies to be filtered in the filter, and the differences in the operating temperatures. For the structure of adaptation inclined wall 21, outer seal ring 5 is provided with sealed inclined plane, and sealed inclined plane and inclined wall 21 butt are favorable to further strengthening sealed effect. In addition, the outer wall of the outer sealing ring 5 is also provided with a sealing bulge 51, and the sealing bulge 51 is abutted against the inner wall of the side wall 11 to ensure the sealing effect.

Continuing to refer to fig. 4, be equipped with pit 24 on the seal ring seat 2, the pit bottom is provided with the solder joint, pit 24 evenly is provided with a plurality ofly along the circumference of seal ring seat 2, weld through bottom solder joint and filter core upper end cover 3, guarantee that firm this technological improvement has more saved the spring and the mounting structure that set up between the bottom of shell 1 and filter core lower end cover 7 among the prior art after the welding, can reduce the distance between shell 1 and the filter core lower end cover 7 simultaneously, further optimized product structure, the part quantity has been reduced, design cost and manufacturing cost have been reduced. In this embodiment, two circumferential side surfaces of the concave pits 24 are arc-shaped, so that the flow area between two adjacent concave pits 24 can be increased, and the efficient circulation of the engine oil in the channel is ensured. Alternatively, the circumferential cross-sectional shape of pocket 24 may be triangular or other shapes. It should be clear that the position of the recess 24 on the sealing ring seat 2 in fig. 4 is only an example. In other embodiments, the dimples 24 may also be disposed inside the inlet 201 or spaced from the inlet 201, and may be disposed uniformly along the circumferential direction of the seal ring seat 2.

As shown in fig. 6, a welding plane is arranged on the upper end cover 3 of the filter element and used for welding with the concave pit 24, the welding plane is arranged at the end part of the filter element, and side lugs bent towards the same direction are arranged on the inner side and the outer side of the welding plane and used for sealing the filter element 4 connected with the welding plane and separating an oil inlet channel in the whole oil path. In one embodiment, the side ears are integrally stamped and formed. Alternatively, the side ears may be connected to the weld plane by welding or snap-fitting. The filter element upper end cover 3 is contacted with the engine oil to be filtered for a long time, and in order to avoid corrosion, an anticorrosive film can be sprayed on the surface of the filter element upper end cover 3, and the filter element upper end cover 3 can also be made of a material which does not generate chemical reaction with the engine oil. It should be noted that the most critical feature of the cartridge upper end cap 3 is the welding to the gasket seat 2, so the material of the cartridge upper end cap 3 must be thermoplastic or partially thermoplastic. The welding method is not limited, and common welding, pressure welding and brazing are all within the protection scope of the present invention.

As shown in fig. 7, the filter element 4 is used for separating solid particles from the engine oil to be filtered, when the engine oil enters the filter element 4 with a certain size of filter screen, the impurities are blocked, and the clean engine oil flows out through the filter element 4. The common filter element 4 comprises a paper filter element, a chemical fiber filter element, a metal filter element, an active carbon filter element and the like. The filter element 4 in this embodiment is a folded microporous filter element. As will be described in further detail below, the use of pleated microporous filter elements is advantageous because the pleats of the pleated microporous filter element increase the area of the filter media region. It is worth noting that similar effects can be achieved with non-pleated filter elements, but with a corresponding increase in implementation costs. Illustratively, in other embodiments, a plurality of cylindrical filter papers with different radii can be selected and concentrically arranged in the filter element 4, which can also achieve the purpose of increasing the filtering area and improving the filtering effect. Filter core 4 and the coaxial setting of shell guarantee that the distance between the filter core outside and the shell inner wall is the same, and the machine oil that waits to filter that makes 4 circumference each positions of filter core flow through can be more even, avoids the filterable too much too early emergence of certain department to block up to guarantee filter core 4's life.

As shown in fig. 8, in this embodiment, a filter element lower end cap 7 is further disposed at an end of the filter element 4 away from the filter element upper end cap 3, the filter element lower end cap 7 is a disk-shaped stamping part and is connected to the bottom of the filter element 4, an upward bent flange is formed on an outer peripheral edge of the filter element lower end cap 7, a protrusion on the same side as the flange is disposed in the middle of the filter element lower end cap 7, and the protrusion extends into a hollow cavity of the filter element 4 to fix the filter element 4 in a radial direction. In some embodiments, cartridge lower end cap 7 may be omitted, with the aforementioned projections formed on the inside of the bottom end wall of housing 1 to mate with cartridge 4. In an alternative embodiment, the cartridge lower end cap 7 is replaceable, with different cartridge lower end caps 7 having different diameter protrusions to accommodate different models of cartridges.

The filter element lower end cover 7 is a closed disc, which means that the engine oil to be filtered and the filtered engine oil can not pass through the filter element lower end cover 7. However, in other embodiments, one or more openings may be provided somewhere in cartridge lower end cap 7 to allow unfiltered oil to flow to outlet 202, depending on the intended function of the filter media. Filters of the filter-in-filter construction or filters with hydrophobic media typically use this type of cartridge bottom end cap 7. For example, in other embodiments, a bypass valve 71 may be further disposed on the lower end cap 7 of the filter element. When the filter element 4 in the filter is blocked due to excessive impurities, the bypass valve 71 is opened, and the engine oil to be filtered directly enters the engine without passing through the filter element 4.

As shown in fig. 9, the inner seal ring 6 is disposed between the seal ring seat 2 and the filter element upper end cap 3, and the inner seal ring 6 is a rubber seal ring in this embodiment and includes an upper seal surface 61. With reference to fig. 1 and 2, the technical effects of providing the inner seal ring 6 include: first, the inner seal 6 defines the flow direction of the oil to be filtered, and the upper seal surface 61 abuts against the seal flange 25 to completely separate the inlet 201 and the outlet 202. If the inner sealing ring 6 is not arranged, or the inner sealing ring 6 is invalid and damaged, the engine oil to be filtered can directly flow from the inlet 201 to the outlet 202. Optionally, the inner ring of the inner sealing ring 6 is provided with a positioning ring, in this embodiment, the first positioning ring 63 abuts against the outer ring of the sealing flange 25, and the second positioning ring 64 abuts against the inner ring of the filter element upper end cover 3. During the installation process of the filter, the installation and the positioning of the inner sealing ring 6 are realized by a positioning ring. Secondly, the inner circumference of the inner sealing ring 6 is abutted with the oil outlet pipeline 93 on the mounting base 9 to form static seal. When the filter is used, after the filter is screwed into the mounting base 9, the inner sealing ring 6 is in interference fit with the oil outlet pipeline 93, and the oil outlet pipeline 93 applies radial compression load to the inner sealing ring 6, so that the inner sealing ring 6 is guaranteed to realize a sealing effect. In order to better achieve the above technical effects, in other embodiments, the inner seal ring 6 may also be a rubber seal ring containing a metal skeleton, and the metal skeleton inside is used to increase the strength of the inner seal ring 6, so that the shape and the tension of the inner seal ring 6 are maintained. The internal metal framework can be selected to be L-shaped according to the positioning requirement.

With continued reference to fig. 9, in the present embodiment, the inner seal ring 6 further includes a check flap 62, and the check flap 62 is disposed between the inlet 201 and the outside of the filter element 4, so that the oil to be filtered flows in one direction from the inlet 201 to the outside of the filter element. Alternatively, the check flap 62 is integral with the inner seal ring 6, extends laterally from the bottom end of the upper seal surface 61, and is angled. Further optionally, check flap 62 includes a resilient foil inside for increasing the strength of check flap 62. When the engine oil to be filtered flows from the inlet 201 to the outside of the filter element, the check valve 62 is bent and opened by the pressure of the engine oil, and the engine oil to be filtered smoothly flows into the outside of the filter element component of the filter; when the oil pressure in the filter is too high, the filter element assembly is blocked or other conditions cause the backflow of the engine oil to be filtered, the check flap 62 rebounds to close the inlet 201 and prevent the backflow of the engine oil to be filtered. Regarding the inclination angle of 62 and the elastic modulus of the elastic member metal sheet, those skilled in the art can set the inclination angle according to the pressure of the oil in the usage scene of the filter, and the inclination angle is not particularly limited herein.

Referring to fig. 2 and 10, the central tube 8 is disposed inside the filter element 4, and is a cylindrical part, and has a plurality of through holes uniformly distributed on the surface, and the shape of the through holes is not limited, and exemplarily, the through holes are circular. The two ends of the central tube 8 are respectively connected with the filter element lower end cover 7 and the filter element upper end cover 3, and the connection mode generally adopts glue for bonding. The fuel filtered by the filter 3 can flow to the outlet through the through hole, and meanwhile, the central tube 8 can also play a supporting role for the filter element 4, so that the filter element 4 is prevented from collapsing due to softening in the use process. In this embodiment, the central tube 8 is formed by punching a plate, and the two ends of the plate are buckled and fastened together to form the central tube 8. Alternatively, the two ends of the plate material of the central tube 8 may also be fixedly connected by riveting or welding or other manners. Further, the central tube 8 may be integrally formed by injection molding or 3D printing. When the filter is in operation, the oil passing through the central tube 8 must be kept clean, and for this purpose, secondary contamination of the fluid by the central tube 8 itself must be avoided. For example, if the center tube 8 is rusted, it is very likely that the oil will wash the rust off, and the rust and other pollutants will flow into the engine, and the engine will be seriously damaged after a while. Therefore, when the central tube 8 is made of a metal material, attention should be paid to the rust prevention of the material, and an anticorrosive film may be sprayed on the surface, or a material such as photosensitive resin, high-strength plastic, or the like may be selected.

The working process of the invention is as follows:

firstly, the inner sealing ring 6 is assembled on the filter element upper end cover 3, then the filter element upper end cover 3 is welded with the sealing ring seat 2, and then the central tube 8 and the filter element 4 are respectively and fixedly connected with the filter element upper end cover 3 and the filter element lower end cover 7 in sequence to form a filter element assembly. And (3) putting the assembly body into the shell 1, and sealing by using the outer sealing ring 5 to finish the assembly of the rotary filter. The assembled spin-on filter is directly and spirally mounted on an automobile mounting base 9 through a thread wall 111 on a shell 1, so that an oil inlet 91 on the mounting base 9 is correspondingly connected with an inlet 201 circumferentially arranged on a sealing ring seat 2, and an oil outlet 92 on the mounting base 9 is correspondingly connected with an outlet 202 on the sealing ring seat 2. The engine oil to be filtered flows into the inlet 201 from the oil inlet 91 and enters the filter, flows to the space between the outer side of the filter element 4 and the inner side of the shell 1 through the gap between the sealing ring seat 2 and the filter element upper end cover 3 under the blockage of the filter element upper end cover 3 and the inner sealing ring 6, and after being filtered by the filter element 4, solid impurities in the engine oil to be filtered can be filtered by the filter element 4, so that the cleaning engine oil flows to the central tube 8 in a single direction, enters the oil outlet 92 from the outlet 202 along the central tube 8 and flows to the engine from the oil outlet.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The rotary filter is characterized by comprising a shell (1), a sealing ring seat (2) buckled on the shell (1) and a filter element assembly arranged between the shell (1) and the sealing ring seat (2); the shell (1) is cylindrical, one end of the shell is provided with an opening, a threaded part (111) is arranged on a side wall (11) close to the opening, and the threaded part (111) is configured to be in threaded connection with a mounting base;

the filter element assembly comprises a filter element upper end cover (3) and a filter element (4) connected with the filter element upper end cover (3), and the filter element upper end cover (3) is fixedly connected with the seal ring seat (2).

2. The spin-on filter of claim 1, further comprising an outer sealing ring (5), wherein the sealing ring seat (2) is provided with a transverse wall (22) and a vertical wall (23), the inner side of the side wall (11), the transverse wall (22) and the vertical wall (23) together form a sealing groove, and the outer sealing ring (5) is embedded in the sealing groove.

3. A spin-on filter according to claim 2, wherein the seat (2) further comprises a slanted wall (21), and the side wall (11) further comprises a guide wall (112), and the slanted wall (21) and the guide wall (112) are cooperatively guided to facilitate installation of the seat (2).

4. A rotary filter according to claim 3, wherein the outer sealing ring (5) is a circular rubber ring, and the outer wall of the outer sealing ring (5) is provided with a sealing bulge (51); the side wall (11) further comprises a clamping wall (114), and the sealing bulge (51) is abutted against the clamping wall (114) and used for blocking the communication between the interior and the exterior of the filter.

5. A spin-on filter according to claim 1, characterised in that the side wall (11) is provided with an inwardly projecting rib (113), and the bottom surface of the seat (2) abuts the rib (113).

6. The spin-on filter of claim 1, wherein the seal ring seat (2) further comprises a recess (24), and the bottom of the recess (24) is welded with the filter element upper end cover (3).

7. A spin-on filter according to claim 1, further comprising an inner sealing ring (6), wherein the inner sealing ring (6) abuts between the sealing ring seat (2) and the filter element upper end cover (3) for blocking the communication between the inlet (201) and the outlet (202).

8. A spin-on filter according to claim 7, wherein the seal ring seat (2) further comprises a seal flange (25), the inner seal ring (6) being provided with an upper seal surface (61), the upper seal surface (61) abutting the seal flange (25).

9. A spin-on filter according to claim 7, wherein the inner seal ring (6) further comprises a check flap (62), the check flap (62) is disposed between the inlet (101) and the outside of the filter element (4) to make the fluid to be filtered flow from the inlet (101) to the outside of the filter element in one direction, and the check flap (62) and the inner seal ring (6) are of an integral structure.

10. A spin-on filter according to claim 1, wherein the filter element assembly further comprises a filter element lower end cap (7), and the filter element lower end cap (7) is connected to the bottom of the filter element (6).